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Algebra for Applications: Cryptography, Secret Sharing, by Arkadii Slinko

By Arkadii Slinko

This ebook examines the connection among arithmetic and information within the smooth global. certainly, glossy societies are awash with facts which has to be manipulated in lots of alternative ways: encrypted, compressed, shared among clients in a prescribed demeanour, shielded from an unauthorised entry and transmitted over unreliable channels. All of those operations might be understood basically by means of someone with wisdom of fundamentals in algebra and quantity theory.

This publication offers the mandatory heritage in mathematics, polynomials, teams, fields and elliptic curves that's adequate to appreciate such real-life functions as cryptography, mystery sharing, error-correcting, fingerprinting and compression of data. it's the first to hide many fresh advancements in those issues. according to a lecture direction given to third-year undergraduates, it's self-contained with a number of labored examples and workouts supplied to check realizing. it might probably also be used for self-study.

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Additional resources for Algebra for Applications: Cryptography, Secret Sharing, Error-Correcting, Fingerprinting, Compression

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Prαr 1− 1 pr 1 1 ... 1 − p2 pr 1 ... 1 − , pr 1− as required. 2 φ(264) = φ(23 · 3 · 11) = 264 φ(269) = 268 as 269 is prime. 1 2 2 3 10 11 = 80. We also have The following corollary will be important in the cryptography section. 1 If n = pq, where p and q are primes, then φ(n) = ( p−1)(q −1) = pq − p − q + 1. There are no known methods for computing φ(n) in situations where the prime factorisation of n is not known. If n is so big that modern computers cannot factorise it, you can publish n and keep φ(n) secret.

During times of war, orders from military headquarters needed to be sent to the line officers without being intercepted and understood by the enemy. The case of a war is an extreme example where the adversary is clearly defined. But there are also situations where the existence of an ‘adversary’ is less obvious. For example, corporate deals and all negotiations must remain secret until completed. Sometimes two parties want to communicate privately even if they do not have any adversaries. For example, they wish to exchange love letters, and confidentiality of messages for them remains a very high priority.

6 (The Chinese Remainder Theorem) Let a and b be two relatively prime numbers, 0 ≤ r < a and 0 ≤ s < b. 15) that is, N has remainder r on dividing by a and remainder s on dividing by b. Proof Let us prove, first, that there exists at most one integer N with the conditions required. Assume, on the contrary, that for two integers N1 and N2 we have 0 ≤ N1 < ab, 0 ≤ N2 < ab and r = N1 mod a s = N1 mod b, r = N2 mod a s = N2 mod b. Without loss of generality let us assume that N1 > N2 . Then the number M = N1 − N2 satisfies 0 ≤ M < ab and 0 = M mod a 0 = M mod b.

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